Encyclopedia
Gregorian calendar
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The Gregorian calendar is a system of time calculation based on the cyclical orbit of the Earth around the Sun, in which the duration of one cycle of the Earth's orbit around the Sun is taken to be equal to 365.2425 days and which contains ninety-seven leap years over four hundred years1;
Federal Law No. 107-FZ of June 3, 2011 "On the Calculation of Time", as amended on June 3, 2011, Article 2, subpara. 2 // RSFSR. 2011. No. 23. Art. 3247. ↩
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